door. it shocked us out of bed. i went downstairs and, you know, there were police. it was hard to process that this had happened. i still kept thinking they couldn't have gotten it right. >> reporter: bernadette had to tell her parents. >> i said what, what happened to her? was she in an accident? i told her to be careful, you know. i was just shocked and crying. >> i felt so bad and so weak and it was just shocking. >> reporter: back in connecticut, stamford police were getting a surprisingly different vibe from annalisa's boyfriend, nelson. >> was she emotional? >> if he was, he didn't show it to us. >> did he ask what happened to annalisa? >> never to us. >> no, not at all. >> never to us. in fact went to sleep. >> he went to sleep? >> went to sleep in the boathouse. >> as seasoned detectives, what did that say to you? >> it raised a big flag with us. big red flag with us. >> makes you wonder, did nelson know more than he was telling police about the murder of his girlfriend? and what would have been his motive for murder? no one could figure it out, especially his friends.